1223666 has 4 divisors (see below), whose sum is σ = 1835502. Its totient is φ = 611832.

The previous prime is 1223633. The next prime is 1223683. The reversal of 1223666 is 6663221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 958441 + 265225 = 979^2 + 515^2 .

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305915 + ... + 305918.

2^1223666 is an apocalyptic number.

1223666 is a deficient number, since it is larger than the sum of its proper divisors (611836).

1223666 is an equidigital number, since it uses as much as digits as its factorization.

1223666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611835.

The product of its digits is 2592, while the sum is 26.

The square root of 1223666 is about 1106.1943771327. The cubic root of 1223666 is about 106.9598941317.

Adding to 1223666 its reverse (6663221), we get a palindrome (7886887).

The spelling of 1223666 in words is "one million, two hundred twenty-three thousand, six hundred sixty-six".